我厂东风340翻斗车制动凸轮及十字头等零件需中频淬火,零件形状、尺寸及热处理技术要求,材料为40Cr。原中频感应加热淬火时喷水冷却,但常有开裂现象,有时废品率高达16％。十字头裂于轴头处,凸轮裂于凸轮头尖角处。另外,对于其他低合金结构钢(如40MnB、40CrNl、35CrMo)零件,感应加热喷水冷却也常有裂纹产生。为解决此问题,我们采用了聚乙烯醇合成 I plant Dongfeng 340 dump truck brake cam and crosshead and other parts required IF quenching, parts shape, size and heat treatment technology requirements, the material is 40Cr. The original IF induction heating quenching spray cooling, but often cracking phenomenon, and sometimes rejection rate as high as 16%. Crosshead split in the shaft head, the cam split in the cam tip sharp corner. In addition, for other low-alloy structural steel (such as 40MnB, 40CrNl, 35CrMo) parts, induction heating spray cooling cracks are often produced. To solve this problem, we used polyvinyl alcohol synthesis